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([2001:b07:6468:f312:bc4e:7fe8:2916:6a59]) by smtp.gmail.com with ESMTPSA id 18sm3931764wmf.1.2020.01.09.12.42.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jan 2020 12:42:43 -0800 (PST) Subject: Re: [PATCH v3 00/21] KVM: Dirty ring interface To: Peter Xu , "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Christophe de Dinechin , Sean Christopherson , Yan Zhao , Alex Williamson , Jason Wang , Kevin Kevin , Vitaly Kuznetsov , "Dr . David Alan Gilbert" References: <20200109145729.32898-1-peterx@redhat.com> <20200109105443-mutt-send-email-mst@kernel.org> <20200109161742.GC15671@xz-x1> <20200109113001-mutt-send-email-mst@kernel.org> <20200109170849.GB36997@xz-x1> <20200109133434-mutt-send-email-mst@kernel.org> <20200109193949.GG36997@xz-x1> From: Paolo Bonzini Message-ID: <583d04b4-73d2-0ba7-fda6-10e15071a3c4@redhat.com> Date: Thu, 9 Jan 2020 21:42:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20200109193949.GG36997@xz-x1> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/01/20 20:39, Peter Xu wrote: >> >> IIUC at the moment KVM never uses huge pages if any part of the huge page is >> tracked. > > To be more precise - I think it's per-memslot. Say, if the memslot is > dirty tracked, then no huge page on the host on that memslot (even if > guest used huge page over that). > >> But if all parts of the page are written to then huge page >> is used. > > I'm not sure of this... I think it's still in 4K granularity. Right. Dirty tracking always uses 4K page size. Paolo